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Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
Cansat 2008: Tuskegee University Final Presentation
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Cansat 2008: Tuskegee University Final Presentation

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Final presentation by Tuskegee University at CanSat 2008 …

Final presentation by Tuskegee University at CanSat 2008

http://www.astronautical.org/2008/06/15/cansat-2008-tuskegee-university/

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  • 1. Tuskegee University <ul><li>Cansat 2008 </li></ul><ul><li>After – Action Report and Analysis </li></ul>
  • 2. Overview of After-Action Report <ul><li>Attending Members </li></ul><ul><li>Design Overview </li></ul><ul><li>Data as recorded by ground station </li></ul><ul><li>Results of flight (success, failure, and omissions) </li></ul><ul><li>Failure mode analysis </li></ul><ul><li>Lessons learned </li></ul><ul><li>Preparations for next competition </li></ul>
  • 3. Attending Members <ul><li>Software Lead: Christopher Coleman </li></ul><ul><li>Hardware Lead: Brandon Williams </li></ul><ul><li>Advisor: Eldon Triggs </li></ul>
  • 4. Design Overview <ul><li>2.8 inch diameter by 11 inch length planetary exploration payload </li></ul><ul><li>Parachute to surface and record altitude during entire flight </li></ul><ul><li>Transmit data to ground station during flight </li></ul><ul><li>Land upright and detach parachute prior to landing </li></ul>
  • 5. Design Overview <ul><li>Use of COTS hardware to collect data and transmit to ground station (ARTS2 altimeter and TX-900G transmitter/GPS) </li></ul><ul><li>Use hotwire connected to pyros to cut parachute loose </li></ul><ul><li>Use LDM (Lawn Dart Method) to land upright </li></ul><ul><li>Use 9.6V battery to power all functions </li></ul>
  • 6. Ground station data collection <ul><li>Heavy emphasis on collection of altitude data </li></ul><ul><ul><li>Average descent rate was 14.1 feet/sec or 4.3 meters/sec </li></ul></ul><ul><ul><li>Max barometric altitude was 4852 feet / 1330 ft AGL </li></ul></ul><ul><ul><li>Max acceleration was 43.37 meters/sec^2 </li></ul></ul>
  • 7.  
  • 8.  
  • 9. Results of Flight <ul><li>Tuskegee University’s Cansat successfully flew on June 14 th , 2008 </li></ul><ul><li>First Cansat competition for Tuskegee </li></ul><ul><li>Some objectives/requirements met, some were not </li></ul>
  • 10. Objectives achieved <ul><li>Measurement of altitude and transmit to ground station. </li></ul><ul><ul><li>Good link with ARTS2 altimeter and TX-900G transmitter throughout duration of flight (maximum signal strength) </li></ul></ul><ul><ul><li>Storage of data on ground station and flight computer successful </li></ul></ul>
  • 11. Objectives achieved <ul><li>Proper parachute deployment </li></ul><ul><ul><li>Parachute packing was correct and allowed proper deployment </li></ul></ul><ul><ul><li>Parachute deployed and slowed the Cansat to 4.3 m/s average </li></ul></ul>
  • 12. Objectives Missed <ul><li>Landing upright </li></ul><ul><ul><li>Due to weight restrictions, landing legs were not installed. </li></ul></ul><ul><ul><li>Cansat impacted hard soil and was not able to use landing pegs as LDM (Lawn Dart Method) </li></ul></ul><ul><ul><li>Center of gravity higher than expected (roughly centerline of spacecraft instead of low COG) </li></ul></ul>
  • 13. Objectives Missed <ul><li>Parachute separation </li></ul><ul><ul><li>Ultimate altitude not determined correctly prior to launch. </li></ul></ul><ul><ul><li>As a consequence, pyros did not fire and cut parachute cord. </li></ul></ul><ul><ul><li>Method of parachute detachment outlined in PDR and CDR was not able to be used due to weight concerns </li></ul></ul>
  • 14. Bonus Objectives Omitted <ul><li>Due to weight issues, the vacuum motor, parachute release motor, stepper motor/drill, and temperature probe were omitted </li></ul><ul><li>Battery and component weights created issues that prevented attempting any bonus points </li></ul>
  • 15. Failure Mode and Effect Analysis <ul><li>Anticipated failure modes based on severity </li></ul><ul><li>Parachute deployment failure </li></ul><ul><ul><li>Catastrophic failure (complete destruction of system, medium possibility) </li></ul></ul><ul><li>Power system failure (battery disconnect/premature drain) </li></ul><ul><ul><li>Mission failure (not catastrophic, but part of basic requirements, medium possibility) </li></ul></ul><ul><li>Data downlink failure/transmission </li></ul><ul><ul><li>Mission failure (not catastrophic, but part of basic requirements, medium possibility) </li></ul></ul><ul><li>Parachute not detaching </li></ul><ul><ul><li>Mission failure (not catastrophic, but part of basic requirements, high possibility) </li></ul></ul><ul><li>Not landing upright </li></ul><ul><ul><li>Mission failure (not catastrophic, but part of basic requirements, high possibility) </li></ul></ul>
  • 16. Failure Mode and Effect Analysis <ul><li>Actual failure modes based on severity </li></ul><ul><li>Parachute deployment failure </li></ul><ul><ul><li>Did not occur (successful) </li></ul></ul><ul><li>Power system failure (battery disconnect/premature drain) </li></ul><ul><ul><li>Did not occur (successful) </li></ul></ul><ul><li>Data downlink failure/transmission </li></ul><ul><ul><li>Did not occur (successful) </li></ul></ul><ul><li>Parachute not detaching </li></ul><ul><ul><li>Mission failure ( failure occurred) </li></ul></ul><ul><li>Not landing upright </li></ul><ul><ul><li>Mission failure ( failure occurred) </li></ul></ul>
  • 17. Failure analysis <ul><li>Parachute detachment failure </li></ul><ul><ul><li>Pyro switch did not activate due to failure to attain anticipated altitude (wind restrictions) </li></ul></ul><ul><ul><li>Pyro switch was calibrated on descent from apogee as well as time (not enough altitude or time) </li></ul></ul><ul><ul><li>Due to weight restrictions, the ultrasonic rangefinder was omitted and the process of parachute detachment was altered </li></ul></ul>
  • 18. Failure analysis <ul><li>Cansat not landing upright </li></ul><ul><ul><li>Weight restrictions prevented landing legs from being added </li></ul></ul><ul><ul><li>LDM (lawn Dart Method) was used, but the compacted soil prevented the pegs from penetrating the ground sufficiently (Cansat bounced rather than sticking) </li></ul></ul><ul><ul><li>Also, failure of parachute detachment mechanism caused the Cansat to be drug 1-2 feet AFTER landing </li></ul></ul>
  • 19. Lessons learned (generic) <ul><li>Battery/Power source </li></ul><ul><ul><li>Battery did not fail, however last minute changes increased the mass of the battery. </li></ul></ul><ul><ul><li>A larger current was needed to fire the pyro and maintain good downlink </li></ul></ul><ul><ul><li>Battery sizing needs to be more of a focus in the initial stages </li></ul></ul><ul><ul><li>Back up batteries on hand </li></ul></ul>
  • 20. Lessons learned (generic) <ul><li>Structure </li></ul><ul><ul><li>Structure was satisfactory, but needed minor modifications </li></ul></ul><ul><ul><li>Finite Element modeling of structure to properly reduce unnecessary mass </li></ul></ul><ul><ul><li>Consider alternative materials to reduce mass and increase durability </li></ul></ul>
  • 21. Lessons learned (generic) <ul><li>Electronics </li></ul><ul><ul><li>Simplify wiring to reduce mass and possibility of broken connections due to launch / MECO / Parachute deployment </li></ul></ul><ul><ul><li>Use of microprocessors to increase capability and reduce mass </li></ul></ul><ul><ul><li>Move from COTS to hand built parts to tailor functions to specific tasks/objectives </li></ul></ul>
  • 22. Lessons learned (specific) <ul><li>Defining vertical landing. Some orientations were on the long axis instead of the circular diameter </li></ul><ul><li>Use of e-matches for pyros instead of high resistance / small diameter wire (used rocket igniters) as the wire was an abject failure. </li></ul><ul><li>Calibration of ARTS2 flight computer to provide more accurate data (i.e. redefine “up” and “down” </li></ul>
  • 23. Lessons learned (specific) <ul><li>Budget </li></ul><ul><ul><li>Funding: secure sources and commitments and obtain funds EARLY </li></ul></ul><ul><ul><li>Find outside sources in the commercial community as well as academic </li></ul></ul><ul><ul><li>Use funding WISELY! </li></ul></ul>
  • 24. Lessons learned (specific) <ul><li>Team organization </li></ul><ul><ul><li>Find members from other fields (electrical, mechanical, etc) and recruit them. This year was aerospace engineering only. </li></ul></ul><ul><ul><li>Give members tasks based on their individual strengths and fields of study </li></ul></ul><ul><ul><li>Make team meeting regular and give specific outcomes for each meeting </li></ul></ul>
  • 25. Questions?

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